Year SPI (scale 0-100) 2004 20 2005 20 2006 20 2007 20 2008 20 2009 20 2010 30 2011 30 2012 10 2013 10 2014 10 2015 40 2016 30 2017 40 2018 60 2019 60 2020 60 2021 50 2022 50